Gateway 510X H Desktop will not power up

For a while now the PC has been difficult to get running after power is turned off. Have had to disconnect and reconnect power cord multiple times and eventually it would power up. Once powered up it would run just fine all day. This time though it has not responded to the power cord trick. When power is turned on there's a slight squeak rather than a beep, the green light on the mother board comes on but that is it. No fan activity no response to the power button no response from hard drive, no response from the CD drive and no lights on the front panel. I've tried disconnecting the monitor and removing and replacing the watch battery on the mother board. Nothing changes.

It's a really good PC apart from this I don't want the hassle of having to set up a new PC if this one can be repaired. Could this be the power supply unit that needs replacing?

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Assuming "memory cards" refers to RAM:
First, make sure you have the right type of memory; the Gateway 510x uses either (DDR333 PC2700, 184p DIMM) or (400MHz DDR400 PC3200, 184p DIMM) 1 gb memory sticks.
If the RAM type is correct check that it is properly installed. Firmly press the sticks into the slot until the plastic clips on the side snap into place.

Did you make any changes recently (add memory, etc.)? Does it make any beeping noises on startup? I've had this problem occur when putting in the wrong type of memory. If you haven't added memory and there is beeping on startup, find the manufacturer of the MOBO and you should be able to find a beep startup code to tell you what the issue is.